The AK80-8 KV60 without driver has more continuous torque (10 N·m against 9 N·m), more peak torque (25 N·m against 22 N·m) and a higher torque constant (0.199 N·m/A against 0.095 N·m/A), and draws less current at its rating (6.9 A against 12 A). The AK80-9 V3.0 KV100 without driver is lighter (490 g against 570 g) and shallower (38.5 mm against 43.9 mm), and turns faster at the output (390 RPM against 243 RPM). They match on diameter.
The AK80-8 KV60 without driver is US$526 and the AK80-9 V3.0 KV100 without driver is US$537. That is US$52.60 per rated N·m for the AK80-8 KV60 without driver and US$59.67 per rated N·m for the AK80-9 V3.0 KV100 without driver.
| AK80-8 KV60 without driver | AK80-9 V3.0 KV100 without driver | |
|---|---|---|
| Reduction Ratio | 8:1 | 9:1 |
| Rated Torque (N·m) | 10 | 9 |
| OD (mm) | 98 | 98 |
| Weight (g) | 570 | 490 |
| Peak Torque (N·m) | 25 | 22 |
| Motor Constant Km (N·m/√W) | 0.30 | — |
| Rated Voltage (V) | 48 | 48 |
| Rated Speed (RPM) | 243 | 390 |
| Rated Current (A) | 6.9 | 12 |
| Peak Current (A) | 21 | 28 |
| Maximum Torque Weight Ratio (N·m/kg) | 35 | — |
| Height (mm) | 43.9 | 38.5 |
| Back Drive (N·m) | 0.75 | 0.51 |
| Kv (RPM/V) | 60 | 100 |
| Kt (N·m/A) | 0.199 | 0.095 |
| Ke (V/kRPM) | 19.8 | 10 |
| Phase to Phase Resistance (mΩ) | 430 | 160 |
| Phase to Phase Inductance (μH) | 214 | 116 |
| Inertia (g·cm²) | 608.6 | — |
| Mechanical Time Constant (ms) | 0.66 | 0.725 |
| Electrical Time Constant (ms) | 0.5 | — |
| Pole Pairs | 21 | 21 |
| Winding Type | Star Backlash (°) 0.38 | Delta |
| Number of Encoder | 2 | 1 |
| Inner Loop Encoder Type | Magnetic Encoder | Magnetic Encoder |
| Inner Ring Encoder Resolution | 14bit | 16bit |
| Outer Ring Encoder Type | Magnetic Encoder | — |
| Outer Ring Encoder Resolution | 15bit | — |
| CAN Connector | A1257WR-S-4P | — |
| UART Connector | A1257WR-S-4P | A1257WR-S-3P |
| Power Connector | XT30PW-M | XT30PW-M |
| Temperature Sensor | NTC MF51B 103F3950 | NTC MF51B 103F3950 |
| Operation Ambient Temperature | -20℃~50℃ | -20℃~50℃ |
| Driving Way | FOC | FOC |
| Application | Legged Robot, Exoskeleton, AGV | Legged Robot, Exoskeleton, AGV |
| No-Load Speed (RPM) | — | 570 |
| Maximum Torque Density (N·m/kg) | — | 44.9 |
| Backlash (arcmin) | — | 15 |
| Rotor Inertia (g·cm²) | — | 579 |
| Motor Constant (N·m/√W) | — | 0.2387 |
| Number of Slots | — | 36 |
| Noise dB (65cm away the motor) | — | 60 |
| Basic Dynamic Load Rating Cr (N) | — | 2760 |
| Basic Static Load Rating C0r (N) | — | 2810 |
| Insulation Level | — | C |
Rows the two disagree on are marked; the figures are CubeMars'. To put any other two parts side by side, build your own comparison.